Everyone knows that when Andrew Ference isn’t serving the Boston Bruins as a top-four defenseman or spending time with his wife and two daughters, he’s the No. 1 NHL expert on environment causes.

Today it was announced by the NHL Players’ Association that more than 420 association members have signed up for the NHLPA Carbon Neutral Challenge — which the press release describes as “part of the partnership between the NHLPA and the David Suzuki Foundation. It enables NHL players to purchase high quality, Gold Standard carbon credits through Montreal-based not-for-profit, Planetair. These credits offset the travel emissions associated with playing professional hockey and minimize the players’ carbon footprint for their regular season travels.”

Ference, who initiated the challenge, was overjoyed by the news.

“I’m very proud that we’ve offset more than 4,200 tonnes of carbon emissions this season, which is like taking 840 cars off the road for a year,” he said in a statement. “But best of all, I’m hearing of more and more players in the dressing rooms talking about going green.”